So Bill says to use Brasso to free up a valve with deposits on it.
Stuart says no because this will mess up everything. I have to agree with Stuart in almost all cases of this problem. If there is a "deposit" on the valve that is slowing it down Brasso is just the wrong move. Brasso is a very mile abrasive but there is a fine chance that the abrasive will stay in the horn and work on the valves for months. It makes much more sense to remove the deposit, or grime with a cleaner with no abrasive. Some folks still use some type of acid* cleaner and some use ultrasound or other cleaners. These are just liquid, they wash off and are gone after you are done. I use to use abrasive when I was working on piston valves that had dents in the cases but I haven't needed to do that for some time... I learned more efficient ways that didn't wear down the valves and the cases. Sure, competent folk do use abrasives on rotor valves but mostly for refitting after a replating job. *I am vague about the acid because I don't want people trying it... this is dangerous stuff, let's not talk about it. LLBrown, Messingschlager _______________________________________________ post: horn@music.memphis.edu unsubscribe or set options at http://music2.memphis.edu/mailman/options/horn/archive%40jab.org
